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[Solved] Dismantling Bathroom Radiator Safely: Avoid Flooding & Steps to Detach Correctly

gregorsky123 18402 18
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How can I remove a bathroom radiator safely without flooding the house?

Close both valves first: the main thermostatic valve with the knob and the second valve with an Allen key after unscrewing the hex nut [#17761835] Then place a bucket under it, loosen the bottom screws a little and let a few liters of water drain out until it stops dripping; loosening the top plug or vent helps it drain better [#17761835] After that, unscrew the bottom screws fully, lift the radiator slightly upward, and pull it away from the wall [#17761835] If you leave the radiator off, cap the valve with a blind nut so the thermostatic antifreeze function does not open it later at low temperature and flood the apartment [#17762073]
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  • #1 17761812
    gregorsky123
    Level 8  
    Posts: 35
    Rate: 41
    Hello,
    I have attached a view of a typical bathroom radiator. We have not decided on another bathroom and would like to dismantle it.
    I am asking for advice on how to do this without flooding the house :)
    Thank you and best regards,
    Grzesiek
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  • #2 17761835
    stanislaw1954
    Level 43  
    Posts: 15002
    Help: 1981
    Rate: 4560
    Close both valves, the big one with the knob, and the one in the 2nd photo with an allen wrench inserted into the hole after unscrewing the hexagonal nut. After careful tightening, loosen the screws on the bottom of the bucket or other vessel and let out a few liters of water. when it stops dripping, unscrew the screws completely, lift the radiator slightly upwards and pull it away from the wall. To make the water drain better, you can loosen the plug, or if you have a vent at the top of the ladder.
  • #3 17762073
    roman 18
    Level 24  
    Posts: 526
    Help: 66
    Rate: 143
    Buddy, you have a thermostatic valve there, so you should know that if the temperature in the room drops to about 6 degrees, the thermostatic valve will open and flood the apartment, this is an antifreeze function. It is good after removing the radiator to plug the hole on the valve with a blind nut and it will be sure. Regards.
  • #4 17762079
    gregorsky123
    Level 8  
    Posts: 35
    Rate: 41
    Thanks for the tips - I'll give it a try tomorrow night. I bought plugs.
    Regards,
    Grzesiek
  • #5 17763769
    gregorsky123
    Level 8  
    Posts: 35
    Rate: 41
    Radiator removed - unfortunately, both valves are permanently connected to a plastic water pipe. Can I do it myself or do I need a welder?
    Regards
    Attachments:
    • Dismantling Bathroom Radiator Safely: Avoid Flooding & Steps to Detach Correctly IMG_5990.JPG (25 KB) You must be logged in to download this attachment.
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  • #6 17763795
    ta_tar
    Level 41  
    Posts: 6438
    Help: 693
    Rate: 2027
    Do you have water in the system? If so, if you can, you need to drain the water and then unscrew the valve from the connector and screw it in place, plug it if you have a good one. If you can't drain the water, the valves will stick out (a bit dangerous).
  • #7 17763811
    gregorsky123
    Level 8  
    Posts: 35
    Rate: 41
    But I can't turn the valve - the water upstairs is closed.
    the valve from the point of connection with the plastic pipe protruding from the wall rotates without longitudinal movement.
  • #8 17763829
    ta_tar
    Level 41  
    Posts: 6438
    Help: 693
    Rate: 2027
    Hold on 1 and unscrew in 2 or 3
    Dismantling Bathroom Radiator Safely: Avoid Flooding & Steps to Detach Correctly
    It's better for 2 because maybe you can screw the plug on the 3rd.
  • #9 17763855
    gregorsky123
    Level 8  
    Posts: 35
    Rate: 41
    But the nut 1 comes off and the whole valve rotates in relation to the sleeve marked with an arrow.
    Dismantling Bathroom Radiator Safely: Avoid Flooding & Steps to Detach Correctly
  • #10 17763870
    ta_tar
    Level 41  
    Posts: 6438
    Help: 693
    Rate: 2027
    It could be that you have a valve with a clamp ring on the plastic. Pull the valve may come out of the valve.
    Or tighten nut 1 and try to unscrew 3 from 2.
    Show bought something.
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  • #11 17763877
    gregorsky123
    Level 8  
    Posts: 35
    Rate: 41
    Lack of strength :) It would be best to cut the plastic cable and plug it ... I don't want something protruding from the wall because of the bookcase.
    I'm not going to do that myself?

    Added after 3 [minutes]:

    https://www.elektroda.pl/rtvforum/topic3314052.html
  • #12 17763906
    ta_tar
    Level 41  
    Posts: 6438
    Help: 693
    Rate: 2027
    Try it, it's your tube and you know what's best. At most later, let me know what you did for posterity (preferably with a photo).
    Regards.
  • #13 17763912
    gregorsky123
    Level 8  
    Posts: 35
    Rate: 41
    OK - tomorrow visit to Obi and we'll see. Thanks for your help and I'll let you know how it turned out.
  • #14 17764664
    DiGital_Butcher
    Level 11  
    Posts: 31
    Help: 2
    Rate: 5
    gregorsky123 wrote:
    But the nut 1 comes off and the whole valve rotates in relation to the sleeve marked with an arrow.
    Dismantling Bathroom Radiator Safely: Avoid Flooding & Steps to Detach Correctly


    Dude, the pipe is alupex, the connector is eurokonus, you have to pry this clamping ring and only then pull the connector out of the pipe, move it sideways a bit and it will come down, if you cut the pipes, then they will be too short and you will not put on the radiator, you will have to break the wall and extend them.
  • #15 17764702
    gregorsky123
    Level 8  
    Posts: 35
    Rate: 41
    Ok, but I won't be installing the radiator anymore. A room intended for the so-called graciarnia.
    So I am asking for advice on how best to close the wire and preferably flush with the wall.
    Regards
  • #16 17764748
    roman 18
    Level 24  
    Posts: 526
    Help: 66
    Rate: 143
    My friend. on a par with the wall, you can't, unless you cut it in the wall and insert the plug deeper. If you have the opportunity, plug it in the distribution box, and then you will cut it right next to the wall and it will not interfere. Regards.
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  • #17 17765072
    DiGital_Butcher
    Level 11  
    Posts: 31
    Help: 2
    Rate: 5
    Exactly as a colleague writes above, if you have instances from the manifold, then locate which radiator it is and unscrew it from the manifold and plug the exits from it, and the pipes are forged a little in the wall and cut, and if the installation is distributed from tees, you have to plug it in the wall, you can for this, use the connectors that you had screwed into the valves for this radiator, only you need to screw half-inch plugs into them, come on, it would be better to press the plugs on these pipes, but for this you need to have a crimper
  • #18 17766432
    gregorsky123
    Level 8  
    Posts: 35
    Rate: 41
    On Monday the plumber will come and we will close the topic in the manifold.
    Thank you for your help and best regards
  • #19 17831547
    gregorsky123
    Level 8  
    Posts: 35
    Rate: 41
    Plumber visit - disconnection of the heater in the distribution box.
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Topic summary

✨ The discussion revolves around safely dismantling a bathroom radiator without causing flooding. Key steps include closing both valves, draining water from the radiator, and using plugs to prevent leaks. Users highlight the importance of managing thermostatic valves to avoid flooding if temperatures drop. Challenges arise when valves are connected to plastic pipes, with suggestions to either unscrew or cut the pipes for proper closure. The conversation concludes with plans to have a plumber assist in disconnecting the radiator at the manifold and sealing the pipes appropriately.
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FAQ

TL;DR: To remove a bathroom radiator safely, cap the thermostatic valve and drain at the unions. Stat: antifreeze opens near 6°C; “the thermostatic valve will open” if it gets cold. Use a blind nut to prevent flooding. [Elektroda, roman 18, post #17762073]

Why it matters: This FAQ helps DIYers detach ladder radiators without leaks, avoid antifreeze-trigger floods, and choose clean pipe-closure options.

Quick Facts

How do I remove a bathroom ladder radiator without flooding?

Close both valves first. Unscrew the lockshield’s hex cap, insert an Allen key, and close it gently. Place a tray under both bottom unions. Loosen unions to drain a few liters. Open the top vent to improve flow. When dripping stops, undo unions fully. Lift the radiator slightly and pull it from the wall. Expert tip: “Close both valves.” 1. Close supply and return. 2. Drain at unions, vent top. 3. Lift off brackets. [Elektroda, stanislaw1954, post #17761835]

What does the thermostatic valve’s antifreeze do, and why cap it?

Antifreeze opens the thermostatic valve around 6°C, allowing flow even when you think it’s off. That can flood an open circuit. Install a blind nut on the valve port after removal. That hardware block prevents accidental flow. Expert quote: “If the temperature in the room drops to about 6 degrees, the thermostatic valve will open.” Capping the port removes this failure path during cold snaps. [Elektroda, roman 18, post #17762073]

How do I close the return/lockshield valve with an Allen key?

Unscrew the lockshield’s hexagonal cover to reveal the internal hex. Insert the correct Allen key. Turn clockwise until it stops, then snug slightly. Do not force it. This seals the return side before you crack the unions. Finish by checking for drips while you start the controlled drain. [Elektroda, stanislaw1954, post #17761835]

My valve spins on the plastic pipe—what connector is this?

You likely have an Alupex pipe with a eurokonus connector. Pry off the clamping ring, then pull the connector from the pipe. Shift the connector sideways to release it. If you cut the pipes short now, you may need to break the wall to re-extend them later. [Elektroda, DiGital_Butcher, post #17764664]

Can I just cut the PEX/MLC pipes and plaster them over?

Better to isolate at the manifold. Identify the radiator circuit, unscrew it at the manifold, and cap those outlets. Then forge a small chase and cut pipes near flush. If the system uses tees, plug the line in the wall. You can reuse valve connectors with 1/2-inch plugs, or press caps if you have a crimper. [Elektroda, DiGital_Butcher, post #17765072]

I can’t drain the system—can I leave valves sticking out temporarily?

You can, but it is risky. With water still in the system, open unions will leak. Leaving valves protruding without a drain-down is “a bit dangerous.” If you must wait, keep both valves fully closed and capped. Schedule a system drain and proper capping soon. [Elektroda, ta_tar, post #17763795]

How do I plug the open valve ports after removing the radiator?

Install a blind nut on the thermostatic valve port after removal. This ensures the antifreeze function cannot feed water into the open circuit. Capping the port gives peace of mind during temperature drops and while the radiator stays off the wall. [Elektroda, roman 18, post #17762073]

I want the pipes flush with the wall—what are my options?

You can’t finish perfectly flush unless you open the wall. Cut a recess, set the plug deeper, and patch. The cleaner method is to isolate and cap at the distribution box (manifold). Then cut near the wall surface so nothing protrudes. [Elektroda, roman 18, post #17764748]

Which union should I undo first, and how do I hold things?

Hold the valve body with one wrench to counter-torque. Undo the union nut on the side you plan to plug. It’s better to loosen the union that lets you immediately install a cap or plug afterward. This controls drips and speeds cleanup. [Elektroda, ta_tar, post #17763829]

What tools and parts should I prepare beforehand?

Prepare an Allen key for the lockshield, two adjustable wrenches, a bucket or tray, rags, and a vent key. You’ll also want PTFE tape for re-sealing any unions you reseat. Set a towel under the radiator before you lift it off the brackets. [Elektroda, stanislaw1954, post #17761835]

I’m removing the radiator permanently—what’s the best closure method?

If you have a manifold, isolate the circuit there and cap those outlets. Forge a small chase and cut the wall pipes near flush. If your system uses tees, plug the line in the wall. You can reuse connectors with 1/2-inch plugs or use press caps with a crimper. [Elektroda, DiGital_Butcher, post #17765072]

Do I need a plumber, or can I DIY?

You can DIY the radiator removal if you can close valves and manage drainage. For manifold work, many call a pro. In this thread, the final solution was a plumber disconnecting the heater at the distribution box for a clean finish. [Elektroda, gregorsky123, post #17831547]
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